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Author(s):	Bezuijen, A.
Title:
Abstract:	The bentonite and grout flow around a TBM is elaborated, as well as grout flow along the lining. The calculated grout flow along the lining is compared with the results of measurements. Measurement data for the flow around the TBM are not available. Both the bentonite and the grout are modelled as a Bingham liquid and it will be shown that, due to the relatively low flow velocities, the yield stress is the governing parameter. The results of the calculations show that both the flow around the TBM and the flow around the lining may significantly influence loading on the TBM, the soil, and the lining. The bentonite and grout flow around the TBM may result in a lower volume loss than calculated when assuming that the soil follows the tapered TBM. The grout flow and especially grout consolidation lead to lower pressures around the lining if the tunnel is constructed in sandy soil. Der Bentonit- und MÃ¶rtelfluss um eine TBM und der MÃ¶rtelfluss entlang der Auskleidung werden diskutiert. Der berechnete MÃ¶rtelfluss entlang der Auskleidung wird mit Messdaten verglichen. FÃ¼r die StrÃ¶mungen um eine TBM existieren keine Messdaten. Sowohl der Bentonit als auch der MÃ¶rtel werden als Bingham FlÃ¼ssigkeit modelliert, und es wird gezeigt, dass wegen der relativ niedrigen StrÃ¶mungsgeschwindigkeiten die FlieÃŸspannung der bestimmende Parameter ist. Die Ergebnisse der Berechnungen zeigen, dass sowohl die StrÃ¶mung um die TBM als auch entlang der Auskleidung einen bedeutenden Einfluss auf die Belastung der TBM, des Bodens und der Auskleidung haben. Der Bentonit- und MÃ¶rtelfluss um die TBM kann einen niedrigeren Volumenverlust zur Folge haben als berechnet, wenn man annimmt, dass der Boden der konisch zulaufenden TBM folgt. Der MÃ¶rtelfluss und besonders die MÃ¶rtelverfestigung fÃ¼hren zu einem niedrigeren Druck auf die Auskleidung wenn der Tunnel in sandigem Boden errichtet wird.
Source:	Geomechanics and Tunnelling 2 (2009), No. 3
Page/s:	294-303
Language of Publication:	English/German

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